Where are not allowed to use cell phones?

Because each has its own frequency band communications are, the filter will filter the signal in addition to their other bands, so the communication between devices generally disturbing each other.
Shielding device is different, shielded instrument will be used to send a large number of communication band interference signals, such as China Unicom and mobile phone frequency bands. These signals will cause the base station can not receive the normal range of terminals (mobile phones) sent coded signals.cell phone jammer could be widely used in meeting room, hall, courtroom, inquest room, jail, library, examination room, gas station, oil house, military and command center, etc. Reflected in the mobile phone is no signal, because the phone signal strength of the principle is that every so often to the base station sends a service request, said request for service, the base station sends a response that provide services, mobile response received and the proportion of missing out on the conversion shows the signal for your cell phone number. The so-called cell phone jamming device in the box under the signal shows 0 requests that you were all garbled signal interference, mobile phones and base stations communicate completely cut off.
Previously captured in the new cheating device is a report prepared by the Union without the band, the two terminal devices connected directly to the completion of microwave communication. cell phone jammer has been widely applying in occasions where are not allowed to use cell phones. Shielding device does not interfere with naturally to the band. In order to avoid even the new band was found and shielding, and to avoid using the same equipment as band interference (that is, string lines, all with the band receiving equipment have received all the information sending device), last year cracked the gang had discovered cheating of a band at 10 under communication equipment.
My current short-term projects for cheating recently seized equipment, a provincial education department for the development of this year's examination room shielding device, interference bands found cheating. Long-term project is to develop based on the three self-sniffing examination room shielded nuclear device, in theory, now the communications equipment to the then all-powerful shield and should be very easy to locate the suspect.BH-201 cell phone jammer are all formed by the latest patches and integrated circuits. From then to now developed the large-scale use should still have some time. If the just-released this year in the new frequency bands for communication equipment, then shielded instrument should still difficult to have their effect. If it is legitimate to in a shielded instrument where to get the signal, I suggest you can contact about related communications specialists, production in the shielding device can not interfere with the frequency band communications equipment, and the other under international law, and related documents, you need international the Union to apply to use of the band.
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Now on the market can limit cell phone signal jammers 500M meters away from the launch pad, and a radius> 20 m cell phone signal. The BH-201 cell phone jammer has excellent performance. Shielding radius adjustable, it is only block mobile phone signals without an impact on other electronic devices. Save energy, power 20W - 480w.
    Phone work, in a certain frequency range, mobile phones and base stations via radio waves to link up to a certain baud rate and modulation for data and voice transmission.